Route 225 Manga by Chiya Fujino, Takako Shimura

14-year-old Eriko finds herself left in charge of her younger brother Daigo when their parents suddenly disappear one warm summer evening.
Trapped in a world that is very much like their own save for the lack of their parents, Eriko and Daigo find themselves desperate to return to the worrywart mother and apathetic father they never thought they'd miss so badly...